A=int(input())
if A>=30:
    print("Yes")
else:
    print("No") A=int(input()) A int(input()) int input() input if A>=30:
    print("Yes")
else:
    print("No") A>=30 A 30 print("Yes") print "Yes" print("No") print "No" A=int(input()) int(input()) A
A=int(input())
if A>=30:
    print("Yes")
else:
    print("No")
